Icom IC-A23 Service Manual page 34

11 - 2 RF UNIT
VCC
9.3V
TXC
RFDETV
VORON
Q20
UN9115
+5V
R5C
IC2
TC4W53FU
DETO
C197
0.01
+5V
C281
0.1
R157
100k
R5C
J3
JACKDET
1 40
OE
VOLCK
2 39
SBATT
38 RFSTB
3
CHGC
SCK
4 37
TXC
VOLDATA
5 36
SDATA
GND
6 35
VCC
GND
7 34
VCC
PTT
8 33
UNLK
EXTPTT
9 32
PCK
LIGHT
10 31
TO
LOGIC PSTB
UNIT DASTB
11 30
J1 PDATA
GND
12 29
EXTMIC
GND
13 28
GND R549
GND
14 27 120k
+5V
15 26 VREC
HV
GND
16 25
HV
BEEP
17 24
VORDET
18 MOD
23
RFDETV
19 GND
22
VORON
GND
20 21
RSSI
COMPLETE VIEW
C50
1
Q7
RX: 0.0V
2SB1132 TX: 4.9V
Q8
R39
10k
2SC4211
T+5 D6 R37
MA77 470
C51
C52 D7 C48
R40
0.1 0.001 MA111 C49 0.001
3.3k
R38 R36
2.2
100 100
C47
0.001
Q19 C113
10
UN9210
RX: 4.8V
R98 R95
150k 180k TX: 0.0V
D18 R99
MA111 220k
C111
Q18 0.01
RX: 1.4V
R100 2SC4211
8 7 6 5 100k TX: 0.0V
R102
100k
R96
1 2 3 4
R101
R97 56k
330k C114 C112
4.7k
0.01 0.1
IC13
VORDET
C117 NJM2107F
0.1
5
RSSI 4
C118
2
Q21 100p
RX: 2.5V
C115
UN9210
TX: 0.0V
0.22
DETMUTE
+5V
AFC
EMBI
C180
WXC
0.001
16 15 14 13 12 11 10 9 16 15 14 13 12 11 10 9
IC5
IC4
BU4094BCFV
M62354GP
1 2 3 4 5 6 7 8 1 2 3 4 5 6 7 8
SDATA
+5V
R159
100k
LIGHT
LIGHT PTT
S2
S1
JPM1990-2711R
JPM1990-2711R
11 - 2
RX: 0.0V
R30
TX: 3.5V
220
C44
0.001
R34
10k
C402
R29
L13
0.001
15k
D5 R31 0.1 H
C45
1SV246 33k
0.001 C42
R33
0.001
220
C40
8p
Q6
C41
0.001 2SC4403
L14
4.7 H
R32
100
C46 R35
0.001 10k
C43
39p
RX: 1.2V
RX: 4.2V RX: 1.2V
TX: 0.0V TX: 0.0V TX: 0.0V
R5
C106
C107
R93 R84
R90 R88 R85
0.1 0.01
2.2k 4.7k 100k 4.7k 100k
R80
R92 C108 56k
56k 0.01
R87
68k
R79
Q14
C102
390k
0.47
C104 2SD1819
Q16
0.01
Q17 2SC4215
R82
2SC4215 18k
Q15
C100
2SC4215 0.01
R94 R91 R89
C101
C109
100 2.2k 470k
0.001
470p
R83
R81
R86 470k
1.5k
C103
2.2k
0.1
RX: 0.2V
R153
TX: 0.0V
1M
1
3 RX: 0.2V
C116 TX: 0.0V
0.22
R155 R154
D100
1M 1.5M
MA8024
L42
R133
R138 R137 C199 C177
4.7 H 100k W17
470k 47k 68p 15p
C175
D26
33p
C178
C179 HVU17
X2
0.1 0.01
29.600MHz
IC3
TB31207AFN
C198
R158
EP1
2p
1 16 22k
FIN1 CP1
2 15
GND VCC
3 14
CLK XIN
4 13
XOUT
DATA
5 12
STB BO
6 11
BS1 LD
10
7
BS2 GND
8 9
FIN2 CP2
UNLK
WXC
AFC
HV
EMBI
CHGC
SBATT
VCC
+5V
C597
0.01
BEEP
IC510
C541
R550
TC75W51FU
4.7
100k
8 1
7 2
MOD 6 3
5 4
R557
C595 C596
R551 R553 39k
R556 0.01 150p
100k 100k
47k
R555
C594
47k
0.0027
R554
500k
VOLCK
VOLDATA
JACKDET
EXTMIC
EXTPTT
R160
47k
C540
VREC 3
4.7
1
R163
100k
R162
100k
RX: 0.0V C33
R17
TX: 3.2V R20 0.001
56 12k
R27
1k
R19 C32
C29
R22 L12 10k 0.001 R18
D4 0.001
80nH 33
1SV246 2.2k
C36
L11
C35
0.001
68nH
33p
Q4
2SC3357 Q3
R25 R21
RX: 0.0V C34
2SK2973
1k
1k 39p
TX: 3.2V
R28
Q5
100
2SC4211
C39
0.001
R26 R23
R24
C38 C37 10k
100k
10k
0.001 10
X1
R77 R71
C97
CDBCA450CX24 1.2k
6.8k
0.01
R74
100k C201 C91
R75 22p 68p
1k
R76 IC1
C99
10k
10 TA31136FN
C90
0.01
1 16
FI2 OSCIN MIXIN
2 15
CFWC450E
OSCOUT GND
2 1 3 14
MIXOUT N-REC
4 13
VCC N-DET
5 12
IFIN RSSI
4 3 6 11
DEC IFOUT
7 10
FILOUT QUAD
8 9
FILIN AFOUT
C98 C96
0.001 0.1 C94
R73 R72
R70
0.01
100k 470
2.2k
C92
C95 C93
C301
0.01 0.001 0.001
9p
C303
24p
L301 L300
0.22 H 0.22 H
C304 C302 C300
150p 82p
68k
+5V
Q33
C174 R130 C172
2.2k 2SC4116 0.001
0.001
R131
C173 L40
10k
15 LB-342
D25
MA77
Q34
C170 C200 C167
C166
0.001 0.001 0.001
UN9210 82p
C163
2p
R134 L41
2.2k 0.82 H
R129
R135 6.8k
C165
1k
15p
C168
C162
D24
0.1
C164 2p
MA304
C169 2p
1
CP1
5.0V
1.2V C537
0.001 Q36
XP1501
R149
10k
1
8 7 6 5
2
3
C187
R150
IC505 C188 0.001
100k
4.7
M62429FP
R148 R147
C186
1k 12k
0.001
1 2 3 4
C539 R300
0.1 1k
C202
1
R146
C185
10k
4.7
R301
C538
820
0.1
R161
5
270k
4
RF UNIT
IC14
2
NJM2107F
VCC
L9
C26 R14
EXCCL3225U
0.1 22k
L7
C31 R16 R15 C25 C24
L10
36nH R12
0.001 0.001 0.001 R13
50k 33
39nH
68k 47k
C30
39p
W12 L6
L8
19.5nH
27nH
C22
27p
Q2
MP2
C27 2SK2974
56p
R78
150k
C83 C82
0.001 0.001
RX: 4.4V
C88
0.01 TX: 0.0V
R64
R69
100
3.3k
R62
C84 470k
R68 L24
0.001 C85
R66
560k 2.2 H
10p
1.8k
FI1
30.050 MHz
Q12
R156
C61
3SK151
1.2k 0.001
C80
Q13
RX: 0.1V
0.001
2SC4215
TX: 0.0V
C81
R65 R63
270p
56 220k
C89
0.01
C87
C204
L43
47p
33p
2.7 H
RX: 0.2V
TX: 0.0V
C205
L44
C206 3p C203
6.8 H
18p 15p
R125 R119
100 470
R123
470
C159
C153
R126 R121
0.001 R120
0.001
220 470
56k
C157
R124 L39
0.001
82nH C156
68k
0.001
C154
Q29
0.001
R127
C158
C161 2SC4403
6.8k
0.5p
0.001
Q30
Q31 R118
C155
15
2SC4226 2SC4226 33p
R128
220 C160
0.001
Q32
2SC4226
HV
EMBI
CHGC
SBATT
VCC
W15
Q35
5
2SB1201
IC6
RX: 9.2V TA7368F
TX: 9.1V
4 1 10
NC POUT
2 9
VCC PWGND
3 8
NC PREGND
4
R145 7
VIN PHASE
10k C184 C196 5
6
RIPPLE
100 0.001 NF
R140
180
C183
R141
4.7
10k
STDET
EXTMIC
EXTPTT
C23
0.001
R61
10k
R60
100k
D17
MA77
C152
0.001
R117
220
R11
1.5k
C182
22p